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IList.IndexOf Method

StringCollection::IList::IndexOf Method

Searches for the specified Object and returns the zero-based index of the first occurrence within the entire StringCollection.

Namespace:  System.Collections.Specialized
Assembly:  System (in System.dll)

private:
virtual int IndexOf(
	Object^ value
) sealed = IList::IndexOf

Parameters

value
Type: System::Object

The Object to locate in the StringCollection. The value can be nullptr.

Return Value

Type: System::Int32
The zero-based index of the first occurrence of value within the entire StringCollection, if found; otherwise, -1.

Implements

IList::IndexOf(Object)

The StringCollection is searched forward starting at the first element and ending at the last element.

This method determines equality by calling Object::Equals.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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